Nissan Sentra Series 3 won't start

Check Engine Light/Loss of Power Due to Throttle Body Unit ...

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The electronic throttle actuator (throttle body) can fail causing a loss of power ... start it studders like it is running on 2 cyl. then switches to 3 cyl. then to 4. but ... Throttle body replaced on my 2006 Nissan Sentra 1.8 engine. ... I Was going up a hill and I tried to speed up, all of a sudden my car bogs down and completely dies.

It could be the fuel system.
It could either flooding or starving for fuel.
If injectors are fouled badly it will wet the plugs and not fire.
If plugs are pitted that makes it easier to flood. (check plug tip condition, check all plug wires and boots are good)

If it is starving -- fuel pump weak (going to fail).
Need to test fuel pump pressure.

Go over it, check the air filter, fuel filter, make sure your key isn`t bent. bent keys off set the chip and the car cant read it. next time take out the key and turn it around and try it again. let me know.

run the fault codes
indicates a problem ambient temp sensor or a Baro sensor that is not report correctly to the ECM so the correct cold start air/fuel mixture is not being set

Next time it does it. try hitting the fuel tank. a couple times if necessary. if it starts back then your fuel pump is dieing. some times when the pump heats up they will stop working, only to come on latter. let me know

Could be a plugged catalitic converter

if its flooding its your fuel pressure regulator

Probably not because the tool reads if the injector is getting pulsesw, not if it is sealing correctly when off. I'd try to take a look at the spark plugs to see if any have fuel on them after you crank once in no-start. "On the floor" likely would take longer because injectors are adding fuel while you are trying to remove it.

Check the ignition coil, i had the same problem before and they also told me that it was a computer problem, if it's a failed computer then it will never start.